VIEWSONIC VG2455 24" 16:9 IPS Monitor - Manual (Page 43)

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Calculating Breaks
When viewing the monitor for extended periods, it is recommended
to take periodic breaks from viewing. Short breaks of at least 5
minutes are recommended after 1 -2 hour of continuous viewing.
Taking shorter, more frequent breaks are generally more beneficial
than longer, less frequent breaks.
Looking at distance objects
While taking breaks, users can further reduce eye strain and
dryness by focusing on objects that are further away from them.
• Eye Exercises
Eye exercises can help minimize eye strain. Slowly roll your eyes to
the left, right, up, down and repeat as needed.
• Neck Exercises
Neck exercises can also help minimize eye strain. Relax your arms
to let them hang at your sides, bend forward slightly to stretch
the neck, turn your head to the right and to the left and repeat as
needed.